I am confused sir , what is the hierarchy of medical advisories ?

In this era of synthesized evidence base, one of my intellectually aberrant student asked Howcan we indulge in a popular coronary procedure with class 1 indication backed by level C evidence ? (As defined by the seemingly invincible guideline committee of various International cardiology organizations .)

*Caution : If you think you haven’t yet reached that the level of individuality , come what may , you are expected follow these advisories which are primarily aimed at providing quality care and you will be pardoned of any adversaries as well !